What is the Gearbox Ratios?

Understanding a little bit about planetary gearbox ratios will be a significant contribution toward specifying the best design for your next application. A couple of factors to consider at the outset include load capacity and the demands of the application itself. With regard to load capacity, the best gearbox ratio for the job will offer the highest torque density in the most compact package possible. Considering the application, the right gearbox ratio for a dynamic, automated task will be built on two factors—the torque needed to accelerate the load and the corresponding inertia match. Simply put, the gearbox needs to increase motor torque to an appropriate level to do the job. Inertia match is a little bit more complex, defined as the load inertia that is reflected to the motor’s axis and divided by the motor’s rotor inertia; this equals the load inertia divided by the gearbox reduction ratio squared.

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